906642942721 has 8 divisors (see below), whose sum is σ = 953282010600. Its totient is φ = 861028909440.

The previous prime is 906642942691. The next prime is 906642942727. The reversal of 906642942721 is 127249246609.

It can be written as a sum of positive squares in 4 ways, for example, as 51387902721 + 855255040000 = 226689^2 + 924800^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 906642942721 - 2¹¹ = 906642940673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (906642942727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256256836 + ... + 256260373.

It is an arithmetic number, because the mean of its divisors is an integer number (119160251325).

Almost surely, 2^906642942721 is an apocalyptic number.

It is an amenable number.

906642942721 is a deficient number, since it is larger than the sum of its proper divisors (46639067879).

906642942721 is a wasteful number, since it uses less digits than its factorization.

906642942721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512517299.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 906642942721 in words is "nine hundred six billion, six hundred forty-two million, nine hundred forty-two thousand, seven hundred twenty-one".